linux-kernel - Re: [PATCH v2] media: venus: add support for selection rectangles

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Date:   Fri, 9 Nov 2018 19:31:35 +0900
From:   Tomasz Figa <tfiga@...omium.org>
To:     mgottam@...eaurora.org
Cc:     Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        Hans Verkuil <hverkuil@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Alexandre Courbot <acourbot@...omium.org>,
        vgarodia@...eaurora.org
Subject: Re: [PATCH v2] media: venus: add support for selection rectangles

Hi Malathi,

On Fri, Nov 9, 2018 at 6:20 PM <mgottam@...eaurora.org> wrote:
>
> On 2018-11-09 07:56, Tomasz Figa wrote:
> > Hi Malathi,
> >
> > On Fri, Nov 9, 2018 at 4:39 PM Malathi Gottam <mgottam@...eaurora.org>
> > wrote:
> >>
> >> Handles target type crop by setting the new active rectangle
> >> to hardware. The new rectangle should be within YUV size.
> >>
> >> Signed-off-by: Malathi Gottam <mgottam@...eaurora.org>
> >> ---
> >>  drivers/media/platform/qcom/venus/venc.c | 26
> >> ++++++++++++++++++++++----
> >>  1 file changed, 22 insertions(+), 4 deletions(-)
> >>
> >> diff --git a/drivers/media/platform/qcom/venus/venc.c
> >> b/drivers/media/platform/qcom/venus/venc.c
> >> index ce85962..d26c129 100644
> >> --- a/drivers/media/platform/qcom/venus/venc.c
> >> +++ b/drivers/media/platform/qcom/venus/venc.c
> >> @@ -478,16 +478,34 @@ static int venc_g_fmt(struct file *file, void
> >> *fh, struct v4l2_format *f)
> >>  venc_s_selection(struct file *file, void *fh, struct v4l2_selection
> >> *s)
> >>  {
> >>         struct venus_inst *inst = to_inst(file);
> >> +       int ret;
> >> +       u32 buftype;
> >>
> >>         if (s->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)
> >>                 return -EINVAL;
> >>
> >>         switch (s->target) {
> >>         case V4L2_SEL_TGT_CROP:
> >> -               if (s->r.width != inst->out_width ||
> >> -                   s->r.height != inst->out_height ||
> >> -                   s->r.top != 0 || s->r.left != 0)
> >> -                       return -EINVAL;
> >> +               if (s->r.left != 0) {
> >> +                       s->r.width += s->r.left;
> >> +                       s->r.left = 0;
> >> +               }
> >> +
> >> +               if (s->r.top != 0) {
> >> +                       s->r.height += s->r.top;
> >> +                       s->r.top = 0;
> >> +               }
> >> +
> >> +               if (s->r.width > inst->width)
> >> +                       s->r.width = inst->width;
> >> +               else
> >> +                       inst->width = s->r.width;
> >> +
> >> +               if (s->r.height > inst->height)
> >> +                       s->r.height = inst->height;
> >> +               else
> >> +                       inst->height = s->r.height;
> >> +
> >
> > From semantic point of view, it looks fine, but where is the rectangle
> > actually set to the hardware?
> >
> > Best regards,
> > Tomasz
>
> As this set selection call occurs before the hfi session initialization,
> for now we are holding these values in driver.
>
> As this call is followed by VIDIOC_REQBUFS(), as a part of this
> we have venc_init_session
>
> static int venc_init_session(struct venus_inst *inst)
> {
>         int ret;
>
>         ret = hfi_session_init(inst, inst->fmt_cap->pixfmt);
>         if (ret)
>                 return ret;
>
>         ret = venus_helper_set_input_resolution(inst, inst->width,
>                                                 inst->height);
>         if (ret)
>                 goto deinit;
>
>         ret = venus_helper_set_output_resolution(inst, inst->width,
>                                                  inst->height,
>                                                  HFI_BUFFER_OUTPUT);

Something sounds not right here. Shouldn't one of the width/height be
the OUPUT format and the other the selection CROP target rectangle?

>         if (ret)
>                 goto deinit;
>
>         ret = venus_helper_set_color_format(inst, inst->fmt_out->pixfmt);
>         if (ret)
>                 goto deinit;
>
>         ret = venc_set_properties(inst);
>
>
>  From here we set these values to hardware.

Okay, thanks for the explanation. In this case, we must return -EBUSY
if selection is attempted to be set after the session is initialized.

Best regards,
Tomasz